Notifiable share interest in JCR Pharmaceuticals

Notifiable Share Interest in JCR Pharmaceuticals Co., Limited

GlaxoSmithKline plc ("GSK") announces that, on 26 March 2010, GSK entered into an agreement with Mitsui Principal Investments for the acquisition of 3,076,923 Common shares of JCR at a total cost of approximately £29.2 million. The details of this transaction have been disclosed in an announcement issued by GSK to the Press Club of the Tokyo Stock Exchange on 29 March 2010.

Upon completion of this transaction, GSK's interest will increase from 16.73% to approximately 25% of the outstanding Common shares of JCR. At that time GSK's total holding will represent approximately 25% of the total voting rights in JCR.

Simon M Bicknell

Company Secretary

29 March 2010